The Doctor was indeed in need of distraction - the loss of two of his closest Companions had set him into a tizzy the other night, mostly because it reminded him of the emotions he went through when he'd lost them before, when the Weeping Angels took them. His hearts couldn't bear the thought of losing them again. And so tonight he would put on a mask and behave in an almost manic way, with large, bold gestures, determined to have fun, even if it hurt him.
He took in the sights and sounds of the nightclub, smiling broadly at the pulsating lights and crowded bodies moving to the deafening music. He only nominally paid attention to Lucifer as he led him up the stairs, but answered his question, "There's this drink I heard about called Blue Bubbles, supposed to taste like whatever drink you want. Do you have that?"
Only then did he realize, "Are you taking me to Outer Space?" he asked, grinning.